I dont need the answers for 6,7,10,14,18 or 19 for a better picture go to http:/
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I dont need the answers for 6,7,10,14,18 or 19 for a better picture go to http://virtucoresystems.webs.com/untitled(2).jpg
What does each of the following acronyms represent, and how is each one related to the birth of the network data model? CODASYL SPARC ANSI DBTG What three languages were adopted by the DBTG to standardize the basic network data model, and why was such standardization important to users and designers? Describe the basic features of the relational data model and discuss their importance to the end user and the designer Explain how the entity relationship (ER) model helped produce a more structural relational database design environment Use the scenario described by A customer can make many payments but each payments is made by only one customer" as the basis for an entity relationship diagram (ERD) representation. Why is an object said to have greater semantic content than an entity? What is the difference between an object and a class in the object oriented data model (OODM)? How would you model Question 8 with an OODM? (Use Figure 2.7 as your guide). What is an ERDM, and what role does it play in the modern (production) database environment? In terms of data and structural independence. compare file system data management with their five data models discussed in this chapter. What is a relationship, and what three types of relationship exist? Give an example of each of the three types of relationship. What is a table, and what role does it play in the relational model? What is a relational diagram? Give an example. What is logical independence? What is physical independence? What is connectivity? (Use a Crow's Foot ERD to illustrate connectivity)Explanation / Answer
18. Logical independence: The logical independence is a capacity of change conceptual schema without change external schema. 19. Physical independence: The Physical independence for chaNge internal schema without change the conceptual schema I hope this will helps to You !
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